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Nanoscale dielectric resonators and quantum-confined semiconductors haveenabled unprecedented control over light absorption and excited charges,respectively. In this work, we embed luminescent silicon nanocrystals (Si-NCs)into a 2D array of SiO2 nanocylinders, and experimentally prove a powerfulconcept: the resulting metamaterial preserves the radiative properties of theSi-NCs and inherits the spectrally-selective absorption properties of thenanocylinders. This hierarchical approach provides increased photoluminescence(PL) intensity obtained without utilizing any lossy plasmonic components. Weperform rigorous calculations and predict that a freestanding metamaterialenables tunable absorption peaks up to 50% in the visible spectrum, incorrespondence of the nanocylinder Mie resonances and of the grating conditionin the array. We experimentally detect extinction spectral peaks in themetamaterial, which drive enhanced absorption in the Si-NCs. Consequently, themetamaterial features increased PL intensity, obtained without affecting the PLlifetime, angular pattern and extraction efficiency. Remarkably, ourbest-performing metamaterial shows +30% PL intensity achieved with a loweramount of Si-NCs, compared to an equivalent planar film without nanocylinders,resulting in a 3-fold average PL enhancement per Si-NC. The principledemonstrated here is general and the Si-NCs can be replaced with othersemiconductor quantum dots, rare-earth ions or organic molecules. Similarly,the dielectric medium can be adjusted on purpose. This spectral selectivity ofabsorption paves the way for an effective light down-conversion scheme toincrease the efficiency of solar cells. We envision the use of thishierarchical design for other efficient photovoltaic, photo-catalytic andartificial photosynthetic devices with spectrally-selective absorption andenhanced efficiency.

Integrating quantum-dots and dielectric Mie resonators: a hierarchical metamaterial inheriting the best of both